Antenna



FIG. 1 is a top perspective view of the antenna;

FIG. 2 is a bottom perspective view of the antenna;

FIG. 3 is a front elevation view of the antenna;

FIG. 4 is a rear elevation view of the antenna;

FIG. 5 is a left elevation view of the antenna;

FIG. 6 is a right elevation view of the antenna;

FIG. 7 is a top elevation view of the antenna; and,

FIG. 8 is a bottom elevation view of the antenna.

The evenly spaced broken lines show portions of the article antenna that form no part of the claimed design. 

CLAIM The ornamental design for an antenna, as shown and described. 